28084420460691 has 12 divisors (see below), whose sum is σ = 46361582982832. Its totient is φ = 16048240263216.

The previous prime is 28084420460549. The next prime is 28084420460699. The reversal of 28084420460691 is 19606402448082.

It is a happy number.

28084420460691 is a `hidden beast` number, since 2 + 8 + 0 + 8 + 4 + 4 + 20 + 4 + 606 + 9 + 1 = 666.

It is not a de Polignac number, because 28084420460691 - 2¹⁹ = 28084419936403 is a prime.

It is a super-2 number, since 2×28084420460691² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28084420460699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222892225816 + ... + 222892225941.

Almost surely, 2^{28084420460691} is an apocalyptic number.

28084420460691 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28084420460691 is a deficient number, since it is larger than the sum of its proper divisors (18277162522141).

28084420460691 is a wasteful number, since it uses less digits than its factorization.

28084420460691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445784451770 (or 445784451767 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The spelling of 28084420460691 in words is "twenty-eight trillion, eighty-four billion, four hundred twenty million, four hundred sixty thousand, six hundred ninety-one".